text: #ifndef WORLD
  #define WORLD
  // An abstraction of a world, and everything in it.
  #include "object.h"
  #include <stdint.h>
  
  typedef struct World2D{
    size_t m_num_objs;  // < Do you really need a comment for this one?
    Object2D* m_objs_2d; // < A list of all objects in this world.
  }World2D;
  
  // Add an object to the world
  void add_obj2d(World2D* world, Object2D* obj);
  
  // Create an empty world
  void create_world(World2D* world);
  
  // Print the world
  void print_world(World2D *world);
  #endif